[mkgmap-dev] [PATCH v5] - drive on left + roundabout direction checking

Sat Oct 3 08:22:28 BST 2009

If there's a way you can share a pre-built jar file then I'd be happy to 
check it out as I spent ages fixing roundabouts in the Languedoc earlier 
this year.

(Another common issue I've noticed is ways that don't meet: presumably 
these were made in Potlatch and the resolution isn't high enough for you 
to tell if you didn't connect the ways.  Obviously this breaks routing too.)

Charlie

Mark Burton wrote:
> v5 - added --check-roundabouts option to explicitly enabled
> roundabout checking/reversing.
> 
> Not had much feedback on this yet, anyone (apart from Dermot) tried
> it? Even if you don't drive on the left (almost the whole world?) you
> may care to try out the roundabout checking. About 3% of all the GB
> roundabouts had the incorrect direction (plus a lot of other problems
> that would break the routing).
> 
> ------------
> 
> v4 - improved quality of direction detection
> 
> ------------
> 
> v3 - now reverses the order of the points in roundabouts that have the
> wrong direction so that routing is more likely to succeed.
> 
> ------------
> 
> v2 - now prints OSM URL of first point in dodgy roundabout.
> 
> ------------
> 
> As suggested, moved from rhd to dol.
> 
> Two options are now available --drive-on-left and --drive-on-right.
> 
> By default, you should not have to specify either because mkgmap now
> determines the side of the road to drive on from the direction
> of the first roundabout it processes. But if you don't like
> its choice, you can specify one of these options to override it.
> 
> Also, it now issues a warning for each roundabout it finds that appears
> to go in the wrong direction. I just got 720 warnings when I processed
> the GB map so either there is a problem with the code or there is a lot
> of duff roundabouts. I checked a handful of them and they were all
> wrong.
> 
> Please give it a go and if you find any of the warnings to be wrong,
> please post the OSM URL of the roundabout in question.
> 
> Mark
> 
> 
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